1 | using System;
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2 | using System.Collections.Generic;
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3 | using System.Linq;
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4 | using System.Text;
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5 | using System.Threading.Tasks;
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6 | using HeuristicLab.Common;
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7 | using HeuristicLab.Core;
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8 | using HeuristicLab.Data;
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9 | using HeuristicLab.Encodings.RealVectorEncoding;
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10 | using HeuristicLab.Parameters;
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11 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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12 | using HeuristicLab.Problems.MultiObjectiveTestFunction;
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13 |
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14 | namespace HeuristicLab.Problems.TestFunctions {
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15 | [Item("DTLZ2", " http://repository.ias.ac.in/81671/ [30.11.15]")]
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16 | [StorableClass]
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17 | public class DTLZ2 : MultiObjectiveTestFunction {
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18 |
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19 | private int actualSolutionSize = 2;
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20 | public override int ActualSolutionSize {
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21 | get {
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22 | return actualSolutionSize;
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23 | }
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24 |
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25 | set {
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26 | actualSolutionSize = value;
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27 | }
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28 | }
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29 |
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30 | public override DoubleMatrix Bounds {
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31 | get {
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32 | return new DoubleMatrix(new double[,] { { 0, 1 } });
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33 | }
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34 | }
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35 |
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36 | public override bool[] Maximization {
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37 | get {
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38 | return new bool[actualSolutionSize];
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39 | }
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40 | }
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41 |
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42 | public override int MaximumProblemSize {
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43 | get {
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44 | return int.MaxValue;
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45 | }
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46 | }
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47 |
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48 | public override int MaximumSolutionSize {
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49 | get {
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50 |
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51 | return int.MaxValue;
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52 | }
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53 | }
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54 |
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55 | public override int MinimumProblemSize {
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56 | get {
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57 | return Math.Max(2, ActualSolutionSize);
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58 | }
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59 | }
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60 |
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61 | public override int MinimumSolutionSize {
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62 | get {
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63 | return 2;
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64 | }
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65 | }
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66 |
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67 | [StorableConstructor]
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68 | protected DTLZ2(bool deserializing) : base(deserializing) { }
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69 | protected DTLZ2(DTLZ2 original, Cloner cloner) : base(original, cloner) { }
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70 | public DTLZ2() : base() { }
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71 |
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72 | public override IDeepCloneable Clone(Cloner cloner) {
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73 | return new DTLZ2(this, cloner);
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74 | }
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75 |
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76 |
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77 |
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78 | public override double[] Evaluate(RealVector r) {
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79 | return Evaluate(r, actualSolutionSize);
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80 | }
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81 |
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82 | private double[] Evaluate(RealVector r, int objectives) {
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83 | if (r.Length < objectives) {
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84 | throw new Exception("The dimensionality of the problem(ProblemSize) must be larger or equal than the dimensionality of the solution(SolutionSize) ");
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85 | }
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86 |
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87 | double[] res = new double[objectives];
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88 |
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89 | //calculate g(Xm)
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90 | double g = 0;
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91 | for (int i = objectives; i < r.Length; i++) {
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92 | double d = r[i] - 0.5;
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93 | g += d * d;
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94 | }
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95 |
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96 | //calculating f0...fM-1
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97 | for (int i = 0; i < objectives; i++) {
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98 | double f = i == 0 ? 1 : (Math.Sin(r[objectives - i - 1] * Math.PI / 2)) * (1 + g);
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99 | for (int j = 0; j < objectives - i - 1; j++) {
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100 | f *= Math.Cos(r[j] * Math.PI / 2);
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101 | }
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102 | res[i] = f;
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103 | }
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104 | return res;
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105 | }
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106 | }
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107 | }
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